Check the listing for details. Nitro RC Engine .21 Alpha Plus Dragon IV [3 port] Engine (21-Dragon IV) LutzRC. Condition: New. Listed at 275.00 USD. Alpha Plus 21-Dragon IV .21 Nitro Engine (*Pre Broken in from the Factory*) Free Priority Mail or UPS 3 day shipping. Please contact with any questions! Contents: -Alpha Plus .21 Dragon IV Nitro Engine -Alpha P3 (Hot) Turbo Glowplug -6mm, 6.5mm, 7mm Venturi Specification:Displacement:3.5ccBore:16.26mmStroke:16.8mmPractical R.P.M.:4000~41000rpm Weight:about 360gPorts:3portsSleeve:ABCCrankshaft Diam:14mm diameterCrankshaft: DEC CrankshaftGlow Plug Type:TurboExhaust:RearCarburetor Diam:9.0mm(Variable)Case Material:AluminumCarburetor:3 Needles The Dragon IV, is a pre broken-in, 3 port engine designed to our engineers very highest specification. The Dragon IV has the benefit of being easy to tune and within 2-4 tanks, be ready to race due to the out of the box pre broken-in advantages. The Dragon IV comes with a Ceramic rear engine bearing. Recommended exhaust is the Alpha 2159, and P3 plug.